Getting invalid entrypoint when deploying via terraform

[anuraags]

Hi all,

Looking for a bit of help as I can't seem to work out how to debug further with my current issue (which may or may not be architecture related but I can't tell).

I'm building my rust executable for a lambda runtime and keep getting the InvalidEntrypoint error when invoking it. I'm currently deploying the function using terraform.

The code itself is basically just the code from examples/basic.rs copied into my main.rs file.

Here is the Dockerfile that I use:

# Contents from aws.Dockerfile

FROM rust:latest
RUN rustup target add x86_64-unknown-linux-gnu
RUN apt-get update && apt-get install -y build-essential

Here is my build script:

#!/bin/sh

RUST_TARGET="x86_64-unknown-linux-gnu" # corresponding with the above, set this to aarch64 or x86_64 -unknown-linux-gnu for ARM or x86 functions.
LAMBDA_ARCH="linux/amd64" # set this to either linux/arm64 for ARM functions, or linux/amd64 for x86 functions.
# RUST_VERSION="latest" # Set this to a specific version of rust you want to compile for, or to latest if you want the latest stable version.

docker build -f aws.Dockerfile -t rust-aws-build/1.0 .
docker tag rust-aws-build/1.0 rust-aws-build/1.0
docker run \
    --platform ${LAMBDA_ARCH} \
    --rm --user "$(id -u)":"$(id -g)" \
    -v "${PWD}":/usr/src/myapp -w /usr/src/myapp rust-aws-build/1.0 \
    cargo build --verbose -p rust_async_lambda --release --target ${RUST_TARGET}

And this is my terraform for the lambda function resource:

resource "null_resource" "rust_async_lambda_function_source" {
  triggers = {
    binary = base64sha256(filebase64("${path.module}/../rust-async-lambda/target/x86_64-unknown-linux-gnu/release/rust_async_lambda"))
  }
}

data "archive_file" "rust_async_lambda_archive" {
  output_path = "${path.module}/out/rust-async-lambda.zip"
  type        = "zip"

  source {
    content  = "${path.module}/../rust-async-lambda/target/x86_64-unknown-linux-gnu/release/rust_async_lambda"
    filename = "bootstrap"

  }
  depends_on = [null_resource.rust_async_lambda_function_source]
}


resource "aws_iam_role" "rust_async_lambda_exec_role" {
  name = "rust_async_lambda_exec_role"

  assume_role_policy = jsonencode({
    Version = "2012-10-17"
    Statement = [{
      Action = "sts:AssumeRole",
      Effect = "Allow"
      Sid    = ""
      Principal = {
        Service = "lambda.amazonaws.com"
      }
      }
    ]
  })
}

resource "aws_lambda_function" "rust_async_lambda" {
  function_name = "${var.app_name}-rust-async-lambda"
  filename      = data.archive_file.rust_async_lambda_archive.output_path
  handler       = "index.handler"
  source_code_hash = data.archive_file.rust_async_lambda_archive.output_base64sha256
  role = aws_iam_role.rust_async_lambda_exec_role.arn
  runtime = "provided.al2"

  environment {
    variables = {
      RUST_BACKTRACE = "1"
    }
  }

  tracing_config {
    mode = "Active"
  }
}

And I keep getting the error:

{"errorMessage":"RequestId: 8a5cc143-e3f8-457a-bbf0-640f8ee1012c Error: fork/exec /var/task/bootstrap: exec format error","errorType":"Runtime.InvalidEntrypoint"}

Anyone have any idea what's going on? I'm not getting any build errors during the cargo build and I can see the file is getting extracted correctly (with the bootstrap executable) in the AWS console.

[coltonweaver]

Can you provide a bit of information about the host machine that you're building on?

[arein]

I have the same issue

[calavera]

Error: fork/exec /var/task/bootstrap: exec format error"

This makes me think that either the bootstrap binary in the zip archive is not the right one, or the binary doesn't have exec permissions.